Callback is not called when Screen is dismissed

[villekr]

Screen dismiss callback is not called. Confirmed with the documentation example and by adding print statement to callback function.

https://textual.textualize.io/guide/screens/#returning-data-from-screens

    def action_request_quit(self) -> None:
        """Action to display the quit dialog."""

        def check_quit(quit: bool) -> None:
            print("""Called when QuitScreen is dismissed.""")
            if quit:
                self.exit()

        self.push_screen(QuitScreen(), check_quit)

works as expected in 0.62.0 -> print statement in the console broken from 0.63.0 up to latest 0.68.0 -> no print statement in the console

Kind of critical bug. If callback is not anymore supported then please update the documentation and dismiss function accordingly.

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[willmcgugan]

I cannot reproduce this. You say you can't see the print statement, but does the app exit if you click the Quit button?

Could you please paste the results of textual diagnose.

[davep]

Just to back up what Will says, it's working perfectly fine for my with 0.68.0. As a self-contained example for you to try, complete with very visual feedback:

from textual import on
from textual.app import App, ComposeResult
from textual.screen import Screen
from textual.widgets import Button

class Test(Screen[str]):

    def compose(self) -> ComposeResult:
        yield Button("Yes", id="Yes")
        yield Button("No", id="No")

    @on(Button.Pressed)
    def test_the_callback(self, event: Button.Pressed) -> None:
        assert event.button.id is not None
        self.dismiss(event.button.id)

class ScreenCallbackTest(App[None]):

    def compose(self) -> ComposeResult:
        yield Button("Test")

    @on(Button.Pressed)
    def test_screen_callback(self) -> None:
        def show_result(result: str) -> None:
            self.notify(result)
        self.push_screen(Test(), callback=show_result)

if __name__ == "__main__":
    ScreenCallbackTest().run()

Can you confirm either way what happens for you with that code?

[villekr]

Textual Diagnostics

Versions

Name	Value
Textual	0.68.0
Rich	13.7.1

Python

Name	Value
Version	3.12.2
Implementation	CPython
Compiler	Clang 15.0.0 (clang-1500.1.0.2.5)
Executable	/Users/villekarkkainen/Library/Application Support/hatch/env/virtual/paita/EKbaFG4f/paita/bin/python

Operating System

Name	Value
System	Darwin
Release	23.3.0
Version	Darwin Kernel Version 23.3.0: Wed Dec 20 21:30:27 PST 2023; root:xnu-10002.81.5~7/RELEASE_ARM64_T8103

Terminal

Name	Value
Terminal Application	iTerm.app (3.5.2)
TERM	xterm-256color
COLORTERM	truecolor
FORCE_COLOR	Not set
NO_COLOR	Not set

Rich Console options

Name	Value
size	width=178, height=43
legacy_windows	False
min_width	1
max_width	178
is_terminal	True
encoding	utf-8
max_height	43
justify	None
overflow	None
no_wrap	False
highlight	None
markup	None
height	None

[villekr]

@davep Your example works fine. But the documentation example doesn't work. Dialog is dismissed and if I select 'Quit' the app doesn't quit.

[davep]

@villekr If I run modal03.py and select quit, the app quits. This is with Textual 0.68.0.

[villekr]

Confirmed the behaviour with a new project, which only had textual dependency. Tested both with iTerm2 and macOS built-in terminal app. Same results with both.

0.62.0 - callback is called 0.63.0 (up to 0.68.0) - callback is not called

So definitely and consistently seems to be broken based on my tests.

[willmcgugan]

Have you upgraded Textual and Textual-dev ? i.e. pip install textual textual-dev -U

[davep]

@villekr How are you invoking the quit? Are you pressing the key q, or are you clicking on the option in the footer?

I'm going to guess the latter.

@willmcgugan Can you try the same with modal03.py? If I use the mouse to select the quit option from the Footer, and then attempt to quit from the dialog, it seems the callback isn't called. If I do it by pressing q on the keyboard it works fine.

[willmcgugan]

Ok, I see it if I click the footer and not if I press q!

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[willmcgugan]

Fixed in v0.69.0

[villekr]

Excellent work and super fast fix! Thank you! 0.69.0 confirmed working.